Temperature stability of polyols and sugar alcohols in brines

Abstract

A stabilized composition for use as a well fluid is provided. The stabilized composition includes a brine, a polyol, the polyol in an amount operable to inhibit solid formation, the polyol further operable to dissolve within the brine; and a stabilization compound, the stabilization compound operable to stabilize the polyol, such that the polyol does not degrade at a bottom hole temperature.

What is claimed is: 
     
       1. A stabilized composition for use as a well fluid, the stabilized composition comprising:
 a brine; 
 a polyol, the polyol present in an amount between 5 wt % and 30 wt % of the stabilized composition, where the amount of polyol is operable to inhibit solid formation, the amount of polyol further operable to dissolve within the brine, wherein the polyol is selected from the group consisting of a low-molecular weight polyalcohol, a sugar alcohol, and combinations thereof; and 
 a stabilization compound present at a concentration between 0.01 vol % to 3 vol % of the stabilized composition, where the concentration of the stabilization compound is operable to stabilize the polyol, such that the polyol does not degrade at a bottom hole temperature and the pH of the stabilized composition is maintained at the bottom hole temperature, wherein the bottom hole temperature is greater than 200° F., wherein the stabilization compound is an amine base wherein the stabilized composition is clear. 
 
     
     
       2. The stabilized composition of  claim 1 , wherein the brine is a bromide-based brine. 
     
     
       3. The stabilized composition of  claim 2 , wherein the bromide-based brine is selected from the group consisting of calcium bromide, sodium bromide, potassium bromide, magnesium bromide, ammonium bromide, and combinations thereof. 
     
     
       4. The stabilized composition of  claim 1 , wherein the brine is a chloride-based brine. 
     
     
       5. The stabilized composition of  claim 4 , wherein the chloride-based brine comprises calcium chloride, sodium chloride, potassium chloride, magnesium chloride, ammonium chloride, and combinations thereof. 
     
     
       6. The stabilized composition of  claim 1 , wherein the brine is a combination of a bromide-based brine and a chloride-based brine. 
     
     
       7. The stabilized composition of  claim 1 , wherein the polyol is the low-molecular weight polyalcohol selected from the group consisting of ethylene glycol, propylene glycol, glycerol, polyethylene glycols with molecular weights less than 800 daltons, and combinations thereof. 
     
     
       8. The stabilized composition of  claim 1 , wherein the polyol is the sugar alcohol selected from the group consisting of sorbitol, xylitol, mannitol, threitol, arabitol, and combinations thereof. 
     
     
       9. The stabilized composition of  claim 1 , wherein the amine base is selected from the group consisting of monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine (TETA), tetraethylenepentamine (TEPA), pentaethylenehexamine (PEHA), aminoethylpiperazine (AEP), ethyleneamine E-100, piperazine, diethylhydroxylamine (DEHA), diethylaminoethanol (DEAE), dimethylethanolamine (DMEA), methoxypropylamine (MOPA), morpholine, n-aminopropylmorpholine (APM), 4-[2-hydroxyethyl]morpholine, diglycolamine, N-[3-aminopropyl]diethanolamine, aminoethylethanolamine (AEEA), and combinations thereof. 
     
     
       10. A method of using the stabilized composition of  claim 1  in a wellbore as the well fluid in a well activity, the method comprising the steps of:
 introducing the stabilized composition into the wellbore,
 and 
 
 engaging in the well activity in the wellbore. 
 
     
     
       11. The method of  claim 10 , wherein the well activity is selected from the group consisting of completion activities, packer activities, workover activities, well intervention activities, well abandonment activities, well testing operations, displacement operations, gravel packing operations, frac packing, drilling operations, and fracturing operations. 
     
     
       12. The method of  claim 10 , wherein the brine is a bromide-based brine, wherein the bromide-based brine comprises calcium bromide, sodium bromide, potassium bromide, and combinations thereof. 
     
     
       13. The method of  claim 10 , wherein the brine is a chloride-based brine, wherein the chloride-based brine comprises calcium chloride, sodium chloride, potassium chloride, and combinations thereof. 
     
     
       14. The method of  claim 10 , wherein the polyol is selected from the group consisting of a low-molecular polyalcohol, a sugar alcohol, and combinations thereof. 
     
     
       15. The method of  claim 14 , wherein the polyol is the low-molecular weight polyalcohol selected from the group consisting of ethylene glycol, propylene glycol, glycerol, polyethylene glycols with molecular weights less than 800 daltons, and combinations thereof. 
     
     
       16. The method of  claim 14 , wherein the polyol is the sugar alcohol selected from the group consisting of sorbitol, xylitol, mannitol, threitol, arabitol, and combinations thereof. 
     
     
       17. The method of  claim 10 , wherein the stabilization compound is an amine base, wherein the amine base is selected from the group consisting of monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine (TETA), tetraethylenepentamine (TEPA), pentaethylenetetramine (PETA), pentaethylenehexamine (PEHA), aminoethylpiperazine (AEP), ethyleneamine E-100, piperazine, diethylhydroxylamine (DEHA), diethylaminoethanol (DEAE), dimethylethanolamine (DMEA), methoxypropylamine (MOPA), morpholine, n-aminopropylmorpholine (APM), 4-[2-hydroxyethyl]morpholine, diglycolamine, N-[3-aminopropyl]diethanolamine, aminoethylethanolamine (AEEA), and combinations thereof.